Operating mechanism for rock-drills.



W. A. SMITH.

OPERATING MECHANISM FOR ROCK DRILLS.

APPLICATION FILED SEPT. I4, 1914.

Patented Mar. 20, 1917.

3 SHEET$SHEET 1- W. A. SMITH.

APPLICATION HLED SEPT. 14, 1914.

Patented Mar. 20, 1917.

3 SHEETS-SHEET 2- VII/la OPERATING MECHANISM FOR ROCK DRILLS.

IIHIII ""m M m I AM 1 7 .2 D w A Q lllllll III II II I]! W. A. SMITH.

OPERATING MECHANISM FOR ROCK DRILLS.

APPLICATION FILED SEPT. l4. I914.

Patented Mar. 20, 1917.

3 SHEETS-SHEET 3.

A'ENT @FFTQE.

WILLIAM A. SMITH, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELA- WARE.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed September 14, 1914. serial No. 861,563.

To all whom it may concern:

Be it known that 1, WILLIAM A. SMITH, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented new and useful Improvements in Operating Mechanism for Rock-Drills, of which the following is a specification.

The present invention is designed more especially for drilling mechanism, and one of the objects is to provide a simple, practical and very compact apparatus of the pulsator t e.

In the accompanying drawings,

Figure 1 is a side elevation of the invention, with portions broken away.

Fig. 2 is a'horizontal sectional view there through.

Fig. 3 is a detail sectional view on the line 3-3 of Fig. 2.

Fig. 4 is a front elevation of the mechanism.

Fig. 5 is a cross sectional view on the line 5-.5 of Fig. 2.

Fig. 6 is'a horizontal sectional view on an enlarged scale through the pitman and crank carrier.

Fig. 7 is a detail sectional view on an enlarged scale through the rear cylinder head.

Fig. 8 is a detail sectional view on the line 8-8 ofFig. 1.

Fig. 9 is a plan view of the connection between the upper cylinder side bolt and the motor. v

Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated, a well known form of'shell 11 is employed, having a base 12 that may be suitably held in a clamp, as is well understood by those skilled in the art. The shell is provided with guideways, one of which is shown at 13, and mounted on said guideways is a carriage 14 that can be moved back and forth in the shell by the usual screw feed 15 engaged therewith and having a handle crank 16.

Mounted on the front portion of the carriage 14, is the drilling mechanism, which is of the pulsator type, and comprises two cyl-' inders 17 and '18 located side by side, these cylinders being of different diameters, and one longer than the other. A compressing piston 19 operates in the cylinder 17 and has a rod 20 projecting from the rear head 21 of .is mounted in a chuck sleeve 25 located in the front head 26 of the cylinder 18. A tappet 27 is preferably employed between the piston 22 and thebit 24, to transmit the blows of the former to the latter. A liquidconducting tube 28 extends from the rear end of the cylinder 18, through the piston 22, and into the tappet 27 No claim is made herein to these features, as they constitute the subject-matter of co-pending applications.

Mounted on the rear end of the carriage 14, is an electric motor, designated generally by the reference numeral 29. To this end, said carriage 14 has an upstanding ear 30, and the casing 31 of said motor is provided with spaced ears 32 that are alined with the car 30, a pivot bolt 33, passing through these ears 30 and 32. In the preferred embodiment, a spacing sleeve 34 is interposed between one of the ears 32 and the car 30. It will thus be seen that the motor can be swung downwardly away from the drilling mechanism.

It will be noted by reference to Fig. 2 that the motor is located in rear of the cylinder 18 and the rear head 35 of said cylinder is interposed between the motor and cylinder. This head is held in place by an upper side bolt 36, and a lower side bolt 37 the lower side bolt having its head bearing directly against the cylinder head 35, as shown in Fig. 8, the

upper side bolt 36 passing through a notch 38 formed in said head. The motor casing .31 is provided with a forwardly extending offset hook 39 having an upwardly extending throat 40, in which the upper side bolt 36 is located, and as shown in Fig. 9, this hook has a'rear recess or socket 41, in which the head of the bolt 36 is detachably engaged. As a result, it will be evident that the upper side bolt 36, which is disposed longitudinally of the drilling mechanism and of the apparatus generally, serves to hold the motor against swinging movement and in operative position, and furthermore acts to clamp the rear cylinder head 35 in position between the cylinder 18 and the motor casing.

Located in advance of the rear head- 35' is a bushing 35? into which one of the ports 23 leads, said port being controlled by a'valve 35 that is mounted on a stem 35 surround ingthe tube 28 and normally closed by a spring 35 i V The motor casing 21 is provided on one side with a circular but eccentrically disposed outstanding flange L2, in which is lit-ted an internal ball-race A crank carrier disk 4A- is provided withan inwardly extending circular flange 45 that fits within the ball-race 43 and has a peripheral ball- :race 46. Balls 47 are located in these l'ICGS. An anti-friction peripheral bearing is thus provided for the crank carrier 44. Projecting from the outer face of the crank disk 44 is a crank pin or wrist pin i8, 011 which is mounted a bearing collar 49 held in place by a nut 50, and mounted on the bearing collar a9 is the head 51 of a pitman 52 having a pivotal connection 53 with a head 5% carried by the piston rod 20. The bearing for the wrist pin 48 is protected by a plug 55 threaded into the head 51.

The motor shaft is shown 56, and projects into the flange 455 of the crank oarrier, said projecting portion having thereon a pinion 57 that is in 11168151 with internal gear teeth 58 formed on the inside of the flange 45. It will thus be evident that when the motor shaft 56 is rotated the crank carrier will also be rotated, and through the pitman connection, the piston 19 will be shaft. The rotor, however is normally held against free rotation by friction means, and to this end, the shaft 56 is provided at one end with a flanged or cup-shaped abutment 63 containing spring washers 64 that are borne against by a friction sleeve'65 mounted'on the shaft, and having an enlargement 66 containing friction washers 67, one of which bears against one end of the rotor. A corresponding friction member 68 bears against the-opposite end of the rotor, and is borneagainst by spring washers 69 arranged in a'cup-s'hapedabutment 70 slidably mounted on the free end of the shaft. This abutment 70 is adapted to be moved inwardly to increase the tension upon the frictionsurfaces, by means of a'suitable nut 71. The nut 71 is ordinarily covered and protected by a plug 72 threaded into tion of the motor casing. V 7

Briefly described, the operation of thedevice is as fol-lows: Whenelectric-current is supplied to the motor, the shaft'56 will be the adjacent por rotated, thereby driving the pinion 57 and rotating the crank carrier 59. This will cause the reciprocation of the compression By rotating the handle crank 16., the drilling V mechanism can be fed to its work in a manner readilyunderstood. -It w illbeobvious that the-mechanisn'i is very compact and has proven entirely cificient. The parts are protected from dirt and dust, and yet are readily accessible.

From the foregoing, it is thought that :the

construction, operation and many advantages of the herem ClQSCIlbECl invention will be apparent to those skilled in the art, with out further description, and it will be :un-

derstood that various changes the size, shape, proportion and minor details of construction may be resorted to without depart ing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to :secure by Letters Patent is 1. In apparatus of the character set forth,

the combination with a motor having a case and an internal circular bearing element thereon, of a driven member having a peripheral bearing in said element and also having an internal gear, anda pinion driven by the motor and meshing with the gear.

2. In apparatusof the characterset forth,

the combination with a motor having acase and aninternal ball race flange on one side QGCGiltI'lC *to the rotor of the motor, of a crank carrier having a peripheral ball-race associated with the internal race and also having an internal gear, balls in the races, and a pinion driven by the rotor and mesh ing with the gear.

3. In apparatus of the character set forth, the combination with a motor having a casing provided with an internal circular bear- 1ng on the exterior face of one side, of a rotatable driven member having a peripheral bearing associated therewith and in internal gear, "the rotor of the motor having a shaft projecting into-the driven member eccentrically thereof, and a pinion mounted on the shaft and meshing with the internal gear.

4. In apparatus of the characterset forth, the-combination with mechanism to be operated, of a driving motor therefor, having a casing provided on the external face of one side with an eccentrically disposed internal ball-race, a pitman connected to the mechanism, a crank engaged with the pitman, a crank carrier disk having a peripheral ballrace associated with the internal ball-race, balls in said races, said disk having an internal gear, and a pinion driven by the motor and meshing with the gear.

5. In apparatus of the character set forth, the combination with mechanism to be operated, of a driving motor therefor, a pitman connected to the mechanism, a. crank engaged with the pitman, a crank carrier disk having an eccentrically disposed Wrist pin and an oppositely disposed counter-weight, said carrier also having an internal gear, and a pinion driven by the motor and meshing with said gear.

(5. In apparatus of the character set forth, the combination with mechanism to be operated, of a motor located in rear of the same and having a casing provided with an eccentrically disposed internal ball-race arranged at one side of said casing, a pitman connected to the mechanism, a. disk having an inset flange provided with an external ball-race and internal gear teeth, said flange coacting with the ball-race of the casing, balls located in the ball-races, a wrist pin projecting from the disk and engaged with the pitman, and a counter-weight for the wrist pin also carried by the disk.

7. In apparatus of the character set forth, the combination with a motor having a casing, said casing having on one side an eccentrically disposed internal bearing, of a driven member having a peripheral mounting in said bearing, an internal gear connection between the rotor of the motor and the driven member, and a case covering the driven member and secured to the side of the motor casing over the bearing.

8. In apparatus of the character set forth, the combination with an electric motor, including a casing having a head, of an internal ball race formed upon said head eccentrically to the rotor of the motor, a crank carrier disk rotatably mounted in the ball race and having a peripheral ball race, balls engaged in the races, a pinion mounted on the rotor shaft and arranged Within the carrier, said carrier having an internal gear in mesh with the pinion, and a crank mounted on the exterior of the carrier.

9. In apparatus of the character set forth, the combination with an electric motor, including a casing, field magnets, and a rotor disposed concentrically in the casing, said casing including a head having an outstanding flange disposed eccentrically to the rotor, and a ball race formed therein, a crank disk having an inwardly extending flange arranged within the flange of the casing head, said flange having an internal gear and an external ball race, balls ar ranged in the races, an outstanding crank pin carried by the disk, mechanism to be operated, a crank connected to the mechanism and mounted on the crank pin, and a cover detachably mounted over the crank arm and disk.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses;

WILLIAM A. SMITH. Witnesses:

WILLIAM H. LEONARD, JESSIE TURNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

